Alloyed steel.



its constituents in as follows:

UTED STATES PATE- OFFTOE.

JAMES CHURCHWAR-D, OF MOUNT VERNON, NEW

INTERNATIONAL STEEL COMPANY, NEW YORK, N. Y., A CORPORATION OF DELA- Patented Dec. 29, 119114.

WARE.

ALLOY ED STEEL.

22 1 Specification of Letters Patent.

m. Drawing. Application filed March 18, 1911.

To all whom it may concern:

Be it known that I, JAMES CHURcHvvaRD. a subject of the King of England, residing at Mount Vernon, in the county of West-' chester and State of New York, have invented certain new and useful Improvements in Alloyed Steel, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to alloys containing iron or steel.

One of the objects of the invention is to provide an article of the kind described which shall be highly capable of withstanding shock, impact and vibration.

Another object is to provide an article which shall possess desirable properties for general manufacturing purposes.

Other objects will be in part obvious and in part pointed out hereinafter.

The alloy representedby the composition given below has been found to possess many excellent qualities which make it suitable for a wide variety of uses. The proportions of per cent. by Weight are Steel, approximately 92.40% Nickel, 3.50% Chromium, 2.00% Tungsten, 1.00% Vanadium, 0.35% Manganese, 0.50% Silicon, 0.25%

The steel preferably contains approximately 0.10% to 1.00% carbon.

In manufacturing the alloy the metals mentioned may be used as such or in the form of ferro-alloys thereof: lVhen the latter are added to a bath of molten steel the whole of the alloy melts at thesame time and chemical union of the various elements takes place almost simultaneously throughout the mass.

Silicon is preferably mixed With the other ingredients in the form of the metal itself. In carrying out the admixture the silicon is best added in a molten state to a stream of molten fluid consisting of a combination of the other ingredients, or the silicon may be added in solid form, if it be broken into sufficiently small pieces. Care must be Serial No. 615,303.

found that when used in small quantities it serves to drive out occluded gases from the molten metal and when present in amounts up to 0.75% it also gives elasticity to the molecules. This elasticity of the metal strengthens adhesion and imparts throughout a quality which offers great resistance to impact, shock and vibrations. The effect of the presence of tungsten in the ,alloy has also been carefully studied and it,has been found that When used in amounts from 0.25% to 1.25% it has the property of adding toughness as Well as hardness. Used in quantities over 1.25% it appears to give simply hardness Without additional toughness. The maximum toughness is secured by its use in quantities of 0.75% to 1.00%. When tungsten is properly combined in an alloy of this kind the structure of the steel Will appear finely crystalline. The presence of silicon exercises the beneficial action of producing a steel having great homogeneity and fineness of grain.

The alloys made in accordance With the formula given have a Widely extended use. They find particular application in armor plate, shafting and in general, Where it is necessary to provide a metal which must withstand impact, vibration and shock. The alloys are exceedingly tough and hard and possess exceptional durability and wearing qualities.

Having described my invention, What I claim as new and desire to secure by Letters Patent is:

1. As an article of manufacture, an alloy steel containing nickel, chromium, tungsten, vanadium, manganese and silicon.

2. As an article of manufacture, an alloy YORK, ASSIGNOR TO OHURCHWARD As an article of manufacture, an al- In testimony whereof I aflix my signature, loy composed of the following materials in in the presenceof two wltnesses. approximately the proportions indicated:

steel containing 0.10% to 1.00% carbon, JAMES C 5 92.40%; nickel 3.50%; chromium 2.00%; Witnessesz.

tungsten l.00%; manganese 0.50%; silicon J. THOMSON,

0.25%; vanadium from 0.35% to 0.75%. L. A. WATSON. 

